A train runs at 80 kmph for the first 40 km and the next 30 km at 60 kmph. find the average speed.
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80=40/t ( speed= distance /time)
t= 40/80=1/2
60=30/t
t=30/60=1/2
total time=1/2+1/2=1
avg speed= total distance /total time
40+30÷1/2+1/2
=70÷1=70
t= 40/80=1/2
60=30/t
t=30/60=1/2
total time=1/2+1/2=1
avg speed= total distance /total time
40+30÷1/2+1/2
=70÷1=70
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